Buenos Airesbwā´nəs ī´rēz, âr´ēz, Span. bwā´nōs ī´rās [key], city and federal district (1991 pop. 2,960,976; metropolitan area 11,255,618), the capital of Argentina, E Argentina, on the Río de la Plata. Buenos Aires is inhabited mostly by people of Spanish and Italian extraction, but there are many residents of French, British, German, Eastern European, and Syrian background and some communities of Paraguayans and other Latin Americans.
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